PNEUMATIC TIRE - SUMITOMO RUBBER IND

Title:

PNEUMATIC TIRE

Document Type and Number:

WIPO Patent Application WO/2020/261618

Kind Code:

A1

Abstract:

The present invention provides a pneumatic tire which has excellent durability and ozone resistance. The present invention relates to a pneumatic tire that is provided with a tread part in which a cap tread and a base tread are stacked upon each other, wherein: the adhesive force between a cap tread rubber composition constituting the cap tread and a base tread rubber composition constituting the base tread is 9 MPa or more; and the hardness change due to thermal aging of the cap tread rubber composition as expressed by formula (A) is 3 or less.　(A): (hardness change due to thermal aging) = (hardness after heat treatment) – (hardness before heat treatment) (In the formula, each hardness is the JIS-A hardness of the cap tread rubber composition at 25°C; and the heat treatment is performed by leaving the cap tread rubber composition at rest for 336 hours at the temperature of 90°C at the oxygen concentration of 20%.)

Inventors:

KATO FUMIYA (JP)
MUKOGUCHI DAIKI (JP)

Application Number:

PCT/JP2020/000166

Publication Date:

December 30, 2020

Filing Date:

January 07, 2020

Export Citation:

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Assignee:

SUMITOMO RUBBER IND (JP)

International Classes:

B60C1/00; B60C11/00; C08L15/00

Domestic Patent References:

WO2018110409A1	2018-06-21
WO2016039005A1	2016-03-17

Foreign References:

JPH0117064B2	1989-03-28
JP2016120915A	2016-07-07
JP2018083884A	2018-05-31
JP2016113560A	2016-06-23
JPH01275605A	1989-11-06
JPH05271326A	1993-10-19
JPH05271325A	1993-10-19
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JPH11292924A	1999-10-26
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JPS59133203A	1984-07-31
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JPH0790017A	1995-04-04
JPS4319960B1	1968-08-28
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Other References: